small bug in load_matlab_model
small bug in load_matlab_model

model should still load if "description" field is not present"

zakandrewking/cobrapy,JuBra/cobrapy,jeicher/cobrapy,jeicher/cobrapy,jerkos/cobrapy,aebrahim/cobrapy,jerkos/cobrapy,JuBra/cobrapy,zakandrewking/cobrapy,aebrahim/cobrapy